I already looked at a website that has a bunch of those kinds of photos. I'm immune.
According to some other forum thread, the freak-out bit of Dimps making Sonic the Hedgehog 4 is the opinion that Dimps sucks at making 2D Sonic levels, as opposed to Sonic Team not having made a full 2D Sonic game in forever. Opinions vary on whether it'd be better that Sonic Team makes the game or Dimps makes it. Opinions also seem to vary on what Dimps' involvement was with a few of the handheld Sonic games, which would help in declaring Dimps either a good fit or bad fit.
Personally I'm willing to say Dimps is a bad choice just because of their funny name. I'm so used to any Sonic game being accompanied by "Sonic Team" that having any other developer doesn't seem legitimate.
Wonder what the public opinion is of Traveller's Tales, who I mention because they have (or used to have) another logo I like. They're the guys who do the Lego Everything franchises.